Disabled auto indent for desktops

[applejag]

• [x] I've added a new note in the CHANGELOG.md file, according to docs: https://iver-wharf.github.io/#/development/changelogs/writing-changelogs

Summary

• Disabled the auto-JSON indent in HTTP responses for web browsers

Motivation

Forgot that AJAX requests contains the browser's user agent, so the requests that wharf-web did was indented.